Edit: Im sorry, this is a copy of: https://mojang.atlassian.net/browse/MC-30887

When you use "/setblock ~ ~ ~ [...]" to create a locked chest, normally nothing big happens beside the block appearing. But when you use "/setblock ~ ~1 ~ [...]" to spawn it in your head, the game crashes.

Crashlog:

---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 20.09.13 14:51
Description: Unexpected error

java.lang.NullPointerException
at bil.a(SourceFile:509)
at bil.b(SourceFile:467)
at big.b(SourceFile:579)
at big.a(SourceFile:1055)
at big.b(SourceFile:798)
at awo.aa(SourceFile:758)
at awo.e(SourceFile:681)
at net.minecraft.client.main.Main.main(SourceFile:104)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bil.a(SourceFile:509)
at bil.b(SourceFile:467)
at big.b(SourceFile:579)
at big.a(SourceFile:1055)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bgf['Xmoe'/4, l='MpServer', x=1005,51, y=69,62, z=756,39]]
Chunk stats: MultiplayerChunkCache: 225, 225
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-64,64,-60), Chunk: (at 0,4,4 in -4,-4; contains blocks -64,0,-64 to -49,255,-49), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 22382 game time, 9226 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 106 total; [sm['Bat'/5, l='MpServer', x=991,48, y=16,80, z=763,54], sm['Bat'/6, l='MpServer', x=1001,25, y=18,10, z=765,38], sm['Bat'/7, l='MpServer', x=1002,23, y=23,92, z=744,25], sm['Bat'/34, l='MpServer', x=932,96, y=18,17, z=763,61], ur['Skeleton'/35, l='MpServer', x=931,50, y=23,00, z=770,50], uw['Zombie'/32, l='MpServer', x=929,91, y=49,00, z=704,69], uw['Zombie'/33, l='MpServer', x=942,41, y=35,00, z=749,03], sw['Pig'/38, l='MpServer', x=936,63, y=64,00, z=786,81], sw['Pig'/36, l='MpServer', x=936,22, y=63,00, z=777,88], sw['Pig'/37, l='MpServer', x=934,22, y=64,00, z=788,31], uf['Creeper'/42, l='MpServer', x=953,50, y=57,00, z=712,50], uw['Zombie'/43, l='MpServer', x=944,50, y=35,00, z=746,50], sw['Pig'/41, l='MpServer', x=956,78, y=63,00, z=714,50], uw['Zombie'/46, l='MpServer', x=949,69, y=22,00, z=752,88], ur['Skeleton'/47, l='MpServer', x=949,16, y=22,00, z=753,84], uw['Zombie'/44, l='MpServer', x=945,50, y=35,00, z=745,50], sw['Pig'/45, l='MpServer', x=956,41, y=72,00, z=748,06], sw['Pig'/50, l='MpServer', x=958,03, y=71,00, z=794,56], sx['Sheep'/49, l='MpServer', x=948,09, y=64,00, z=790,88], uf['Creeper'/48, l='MpServer', x=966,03, y=24,00, z=768,41], ur['Skeleton'/55, l='MpServer', x=974,50, y=34,00, z=694,50], ur['Skeleton'/54, l='MpServer', x=973,50, y=34,00, z=690,50], bgf['Xmoe'/4, l='MpServer', x=1005,51, y=69,62, z=756,39], sw['Pig'/59, l='MpServer', x=967,19, y=63,00, z=718,81], uw['Zombie'/58, l='MpServer', x=966,69, y=42,00, z=704,50], uw['Zombie'/57, l='MpServer', x=975,50, y=41,00, z=696,50], sm['Bat'/56, l='MpServer', x=969,75, y=42,10, z=701,25], ur['Skeleton'/63, l='MpServer', x=970,91, y=30,00, z=741,50], ur['Skeleton'/62, l='MpServer', x=972,50, y=23,00, z=729,50], sw['Pig'/61, l='MpServer', x=960,03, y=65,00, z=713,84], sw['Pig'/60, l='MpServer', x=968,53, y=63,00, z=719,75], uw['Zombie'/68, l='MpServer', x=972,50, y=30,00, z=764,50], uw['Zombie'/69, l='MpServer', x=973,50, y=11,00, z=780,56], uf['Creeper'/71, l='MpServer', x=980,50, y=35,00, z=702,50], ur['Skeleton'/64, l='MpServer', x=975,50, y=31,00, z=748,50], uw['Zombie'/65, l='MpServer', x=975,49, y=25,00, z=752,04], ur['Skeleton'/66, l='MpServer', x=964,50, y=33,00, z=750,50], sm['Bat'/67, l='MpServer', x=971,72, y=10,10, z=753,78], sx['Sheep'/76, l='MpServer', x=987,66, y=63,00, z=690,13], uf['Creeper'/77, l='MpServer', x=982,34, y=20,00, z=716,00], ur['Skeleton'/78, l='MpServer', x=991,50, y=41,00, z=713,50], ur['Skeleton'/79, l='MpServer', x=976,56, y=42,00, z=705,78], uw['Zombie'/72, l='MpServer', x=983,50, y=35,00, z=700,50], uw['Zombie'/73, l='MpServer', x=980,50, y=35,00, z=701,50], uw['Zombie'/74, l='MpServer', x=982,50, y=35,00, z=701,50], uw['Zombie'/75, l='MpServer', x=977,50, y=41,00, z=700,50], uw['Zombie'/85, l='MpServer', x=989,38, y=14,00, z=762,94], ur['Skeleton'/84, l='MpServer', x=979,50, y=15,00, z=761,50], sm['Bat'/87, l='MpServer', x=992,70, y=19,36, z=763,69], uw['Zombie'/86, l='MpServer', x=975,11, y=25,00, z=750,59], uf['Creeper'/81, l='MpServer', x=986,50, y=25,00, z=724,50], sx['Sheep'/80, l='MpServer', x=979,81, y=70,00, z=708,50], uw['Zombie'/83, l='MpServer', x=978,06, y=25,00, z=742,50], ur['Skeleton'/82, l='MpServer', x=977,03, y=22,00, z=730,50], sw['Pig'/93, l='MpServer', x=980,75, y=63,00, z=819,41], sw['Pig'/92, l='MpServer', x=987,75, y=63,00, z=817,50], sw['Pig'/95, l='MpServer', x=985,94, y=63,00, z=820,25], sw['Pig'/94, l='MpServer', x=975,03, y=64,00, z=815,84], sm['Bat'/89, l='MpServer', x=1004,99, y=16,52, z=765,67], uf['Creeper'/88, l='MpServer', x=980,63, y=15,00, z=770,00], uf['Creeper'/91, l='MpServer', x=985,00, y=27,00, z=791,34], ur['Skeleton'/90, l='MpServer', x=976,53, y=21,00, z=789,13], ur['Skeleton'/102, l='MpServer', x=993,50, y=24,00, z=730,50], uf['Creeper'/103, l='MpServer', x=1005,50, y=40,00, z=722,50], ur['Skeleton'/100, l='MpServer', x=994,50, y=41,00, z=715,50], sm['Bat'/101, l='MpServer', x=987,06, y=42,77, z=721,00], sm['Bat'/98, l='MpServer', x=973,61, y=22,90, z=711,65], ur['Skeleton'/99, l='MpServer', x=994,50, y=41,00, z=719,50], sm['Bat'/110, l='MpServer', x=994,75, y=21,55, z=740,75], uf['Creeper'/111, l='MpServer', x=1006,94, y=21,00, z=780,50], ur['Skeleton'/108, l='MpServer', x=1007,50, y=24,00, z=742,50], uw['Zombie'/109, l='MpServer', x=1005,50, y=24,00, z=741,50], uw['Zombie'/106, l='MpServer', x=1000,94, y=19,00, z=755,41], uw['Zombie'/107, l='MpServer', x=1000,69, y=18,00, z=745,78], ut['Spider'/104, l='MpServer', x=1002,03, y=21,00, z=741,84], uf['Creeper'/105, l='MpServer', x=999,94, y=21,00, z=744,72], uw['Zombie'/119, l='MpServer', x=1008,50, y=24,00, z=740,50], uf['Creeper'/118, l='MpServer', x=1022,03, y=23,00, z=741,53], uw['Zombie'/117, l='MpServer', x=1019,97, y=23,00, z=744,53], ts['item.tile.flower2.houstonia'/116, l='MpServer', x=1008,88, y=21,13, z=737,75], sm['Bat'/113, l='MpServer', x=994,34, y=22,10, z=764,56], sm['Bat'/112, l='MpServer', x=997,75, y=20,10, z=770,75], uf['Creeper'/127, l='MpServer', x=1026,50, y=23,00, z=742,50], ur['Skeleton'/126, l='MpServer', x=1025,50, y=23,00, z=739,50], uw['Zombie'/122, l='MpServer', x=1009,50, y=29,00, z=805,09], uw['Zombie'/121, l='MpServer', x=1013,50, y=14,00, z=810,50], sm['Bat'/120, l='MpServer', x=1010,46, y=21,37, z=740,77], uf['Creeper'/137, l='MpServer', x=1047,97, y=20,00, z=696,38], uf['Creeper'/136, l='MpServer', x=1050,91, y=19,00, z=701,50], sm['Bat'/139, l='MpServer', x=1047,92, y=19,97, z=691,80], sm['Bat'/138, l='MpServer', x=1045,03, y=20,10, z=681,75], ta['Squid'/141, l='MpServer', x=1039,50, y=47,34, z=716,22], ta['Squid'/140, l='MpServer', x=1043,53, y=44,38, z=717,50], ta['Squid'/143, l='MpServer', x=1043,06, y=57,31, z=763,25], ur['Skeleton'/142, l='MpServer', x=1052,53, y=14,00, z=752,91], ur['Skeleton'/129, l='MpServer', x=1029,50, y=21,00, z=747,50], uf['Creeper'/128, l='MpServer', x=1031,50, y=21,00, z=747,50], sw['Pig'/131, l='MpServer', x=1033,31, y=71,00, z=798,50], sw['Pig'/130, l='MpServer', x=1036,41, y=63,00, z=747,84], uf['Creeper'/133, l='MpServer', x=1031,50, y=12,00, z=816,50], uf['Creeper'/132, l='MpServer', x=1038,50, y=12,00, z=812,50], ta['Squid'/144, l='MpServer', x=1047,25, y=60,00, z=764,63], sw['Pig'/145, l='MpServer', x=1045,88, y=64,00, z=774,16], sw['Pig'/146, l='MpServer', x=1038,91, y=64,00, z=780,84], ta['Squid'/150, l='MpServer', x=1060,38, y=59,34, z=749,59], uf['Creeper'/151, l='MpServer', x=1058,50, y=23,00, z=786,50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bga.a(SourceFile:294)
at awo.b(SourceFile:1872)
at awo.e(SourceFile:695)
at net.minecraft.client.main.Main.main(SourceFile:104)

– System Details –
Details:
Minecraft Version: 13w38a
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_51, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 88716544 bytes (84 MB) / 211705856 bytes (201 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 9299 (520744 bytes; 0 MB) allocated, 1403 (78568 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 13w38a
LWJGL: 2.9.0
OpenGL: AMD Radeon Barts PRO Prototype OpenGL Engine GL version 2.1 ATI-7.32.12, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2638 (147728 bytes; 0 MB) allocated, 637 (35672 bytes; 0 MB) used